png-rs

Exploring PNG file format

Usage

Print help

png-cli image.png -h

Prints info about PNG chunks

png-cli image.png -i

Encodes message: "secret" at the end of PNG file

png-cli image.png -m secret -e end

Encodes message: "secret" at the custom chunk (sMSG)

png-cli image.png -m secret -e chunk

Specifies name for output file

png-cli image.png -m secret -e end -o secret

Tries to decode message

png-cli image.png -d